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Forged blind BL flange

Forged blind BL flange

Blind flange, also known as blind flange, is officially called flange cover. It is a flange without a hole in the middle, used to seal pipeline plugs. There are many types of sealing surfaces, including flat, convex, concave convex, tenon groove, and ring connection surfaces.

  • Item NO.:

    XUVAL33-254
  • Lead Time:

    45 Days
  • Brand:

    XUVAL
  • Shipping Port:

    Shanghai
  • Payment:

    100%TT
  • MOQ:

    10
Products Details
The production process is mainly divided into three types: forging, casting, cutting, and so on.

Cast and forged flanges

The flange produced by casting has accurate shape and size of the blank, small processing volume, and low cost, but there are casting defects (pores, cracks, and inclusions); The internal structure of the casting has poor streamline (if it is a cutting part, the streamline is even worse);

Forged flanges generally have lower carbon content and are less prone to rusting compared to cast flanges. Forged flanges have good streamline, dense structure, and better mechanical properties than cast flanges;

Improper forging technology can also lead to large or uneven grains, hardening cracks, and higher forging costs than cast flanges.

Forgings can withstand higher shear and tensile forces than castings.

The advantage of castings is that they can create more complex shapes and have lower costs;

The advantage of forgings is that their internal structure is uniform and there are no harmful defects such as pores and inclusions in the castings;

The difference between cast flanges and forged flanges lies in the production process, such as centrifugal flanges, which belong to the category of cast flanges.

Centrifugal flanges belong to the precision casting method for producing flanges. This type of casting has a much finer structure and improved quality compared to ordinary sand casting, and is less prone to problems such as loose structure, air holes, and sand holes.


Firstly, we need to understand how centrifugal flanges are produced and produced, as well as the process and product of centrifugal casting to make flat welded flanges. Its characteristic is that the product is processed through the following process steps:

① Place the selected raw material steel into an intermediate frequency electric furnace for melting, so that the temperature of the molten steel reaches 1600-1700 ℃;

② Preheating the metal mold to 800-900 ℃ to maintain a constant temperature;

③ Start the centrifuge and inject the molten steel in step ① into the preheated metal mold in step ②;

④ The casting should be naturally cooled to 800-900 ℃ for 1-10 minutes;

⑤ Cool with water to near room temperature, demould and remove the casting.


Product Neck welding flange; Flat welding flange with neck; Flat flange; Blind flange; Spectacle blind flange
Technology Forge
SIZE 1/2”-120”; DN15-DN3000
Pressure rating 150#;300#;600#;900#;2000#;3000#;6000#;9000#
Material quality ASTM A105N; A182Gr.F304/L; F316/L; A350LF2; A694F42 to F70;WP5;
WP9;WP11;WP22;NACE MR-0175
Standard ASME B16.5; HG20592; DIN2527、2573、2627-2638、2673、2552、2653、2655、2656、2641、2642、2565-2569; GOST12820; JIS B2220
Paint-coat Anti corrosion coating; Galvanizing
Detection Chemical composition analysis; Mechanical properties; Metallographic testing,; Acid resistance test,; Heat treatment; Ultrasonic testing; Penetration test; Magnetic particle testing; X-ray detection; Hydrostatic test; Blasting test; Based on customer needs
Application Water treatment; Power plant accessories; Chemical engineering; Shipbuilding; Nuclear energy; Garbage disposal; Natural gas; petroleum

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    If you are interested in our valves and want to know more details,please leave a message here,we will reply you as soon as we can.